/*
 * Copyright [2020] [MaxKey of copyright http://www.maxkey.top]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 

package org.maxkey.crypto;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;


public class KeyGen {
    public static void main(String[] args) throws Exception {
        String keyInfo="ASDFSDFNUGD__TYTY";
        KeyGen kg = new KeyGen();
        kg.genKeys(keyInfo);
    }


    public void genKeys(String keyInfo) throws Exception {
        KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA");
        SecureRandom random = new SecureRandom();
        random.setSeed(keyInfo.getBytes());
        
        keygen.initialize(512, random);
        // ȡ����Կ��
        KeyPair kp = keygen.generateKeyPair();
        // ȡ�ù�Կ
        PublicKey publicKey = kp.getPublic();
        System.out.println(publicKey);
        saveFile(publicKey, "pk.dat");
        // ȡ��˽Կ
        PrivateKey privateKey = kp.getPrivate();
        saveFile(privateKey, "sk.dat");
    }

    private void saveFile(Object obj, String fileName) throws Exception {
        ObjectOutputStream output=new ObjectOutputStream(
        new    FileOutputStream(fileName));
        output.writeObject(obj);
        output.close();
    }
}
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